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Closing Monitor Connections

Jul 01, 2016

The NetScaler appliance sends probes to the services through the monitors bound to the services. By default, the monitor on the NetScaler and the physical server follow the complete handshake procedure even for monitor probes. However, this procedure adds overhead to the monitoring process and may not be always necessary.

For the TCP monitors, you can configure the NetScaler to close a monitor-probe connection after receiving SYN-ACK from the service. To do so, set the value of the monitorConnectionClose parameter to RESET. If you want the monitor-probe connection to go through the complete procedure, set the value to FIN.

Note: The monitorConnectionClose setting is applicable to all the monitors bound to all the services configured on the NetScaler appliance.

To configure monitor-connection closure by using the command line interface

At the command prompt, type:

set lb parameter -monitorConnectionClose <monitor_conn_close_option>

Example 

set lb parameter -monitorConnectionClose RESET

To configure monitor-connection closure by using the configuration utility

  1. Navigate to Traffic Management > Load Balancing > Configure Load Balancing Parameters.
  2. Select FIN or Reset.

Closing Monitor Connections at the Service or Service Group Level

You can also configure the appliance to close a monitor-probe connection at the service and service group level by setting the monConnectionClose parameter. If this parameter is not set, the monitor connection is closed by using the value set in the global load balancing parameters. If this parameter is set at the service or service group level, the monitor connection is closed by sending a connection termination message, with the FIN or RESET bit set, to the service or service group.

To configure monitor-connection closure at the service level by using the NetScaler command line

At the command prompt, type:

> set service <service_name> -monConnectionClose ( RESET | FIN )

To configure monitor-connection closure at the service group level by using the NetScaler command line

At the command prompt, type:

> set serviceGroup <service_name> -monConnectionClose ( RESET | FIN )

To configure monitor-connection closure at the service level by using the NetScaler GUI

  1. Navigate to Traffic Management > Load Balancing > Services.
  2. Add or edit a service, and in Basic Settings, set the Monitoring Connection Close Bit.

To configure monitor-connection closure at the service group level by using the NetScaler GUI

  1. Navigate to Traffic Management > Load Balancing > Service Groups.
  2. Add or edit a service group, and in Basic Settings, set the Monitoring Connection Close Bit.